On 18 mai 2015, at 13:08, Ewa Stawicka <ewastawicka91(a)gmail.com&gt; wrote: There are three classes AssociationKey, EnityKey, IdSourceKey, which all contains methods: public String[] getColumnNames() public Object[] getColumnValues() public String getTable() and we have three methods in couchdb module: Identifier.createAssociationId, Identifier.createEntityId, CouchDBDatastore.createId, each one does basicly the same, but takes different parameter. Can we extract abstract class AbstractKey, with columnValues field, some getters, createId method? I will need createId method in couchbase module. Ewa _______________________________________________ hibernate-dev mailing list hibernate-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/hibernate-dev